Shock wave interactions in unsteady high-speed compressible flows

非定常高速可压缩流中的冲击波相互作用

• 批准号: RGPIN-2020-05107
• 负责人: Timofeev, Evgeny
• 金额: $ 1.97万
• 依托单位: McGill University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=717389
• 关键词: Shock; wave; interactions; unsteady; speed

The unifying theme of the proposed wide-scope research program is high-speed unsteady compressible flows with shock waves, which are much less studied as compared to their steady counterparts. Its long-term objectives are to study important basic and applied problems involving unsteady shock wave phenomena using the state-of-the-art flow solvers and to continue further development of these numerical tools as would be dictated by the problems under study. The program encompasses three major research directions: (I) Fundamentals of unsteady shock wave reflections from various surfaces and transitions between different types of reflection: a number of issues related to physical mechanisms of these phenomena and interpretations of experimental observations have recently become a hot and contentious topic attracting many researchers; the proposed project is aimed at making crucial and decisive contributions to the debate; (II) Shock wave phenomena in multi-fluid media for two application areas: the implosion of a gas cavity driven by converging shock waves in liquid, which is highly relevant to the prospective nuclear fusion reactors based on the so-called magnetized target fusion; and the shock wave propagation and cavitation bubble dynamics generated by laser pulse energy depositions in liquids, as encountered in medical applications of shock waves; (III) Starting of air intakes for next-generation hypersonic air-breathing engines (scramjets): novel intake starting techniques such as the ones based on the ideas of thin diaphragm rupture or so called "tractor-rocket" will be further studied with more realistic models aiming at finding the ways of their practical implementation. The main research tool of the program will be the set of high-resolution and efficient flow solvers developed earlier by the principal investigator. It is planned to be further developed for more accurate, efficient, and reliable treatment of the above problems. Analytical models will be developed as well. Furthermore, the principal investigator forged close collaborative ties with, arguably, world leaders in experimental diagnostics for some of the above research directions, who would supply their experimental data and additionally perform experiments suggested and designed by the principal investigator. Thus, all three nodes of scientific investigation will be fully engaged. The major outcomes are expected to be discoveries of both fundamental and practical nature in the chosen research areas delivered to research and engineering community via refereed publications in archival journals; extensive training of graduate/undergraduate students in stimulating and in many aspects unique research environment, and further development of general computer codes for unsteady gasdynamics of shocked flows, which are already in use by many researchers worldwide and would undoubtedly serve as a solid base for future research undertakings and practical applications of their results.

拟议的大范围研究计划的统一主题是带有激波的高速非定常可压缩流动，与定常同行相比，对激波的研究要少得多。它的长期目标是使用最先进的流动解算器研究涉及非定常冲击波现象的重要基本和应用问题，并根据所研究的问题继续进一步发展这些数值工具。 该计划包括三个主要研究方向：(I)不同表面非定常冲击波反射的基本原理和不同反射类型之间的转换：与这些现象的物理机制有关的一些问题和对实验观测的解释最近已成为吸引许多研究人员的热点和有争议的话题；拟议的项目旨在对这场辩论做出关键和决定性的贡献；(Ii)多流体介质中的冲击波现象有两个应用领域：液体中会聚冲击波驱动的气腔内爆，这与基于所谓磁化靶核聚变的未来核聚变反应堆密切相关；以及激光脉冲能量沉积在液体中产生的激波传播和空化气泡动力学，如在冲击波的医疗应用中遇到的；(3)新一代高超声速吸气发动机(超燃冲压发动机)进气口的启动：将用更现实的模型进一步研究新的进气启动技术，如基于薄横梁破裂或所谓的“拖拉机-火箭”的想法的进气启动技术，以期找到其实际实施的方法。 该计划的主要研究工具将是首席研究员早先开发的一套高分辨率和高效率的流动解算器。为了更准确、高效、可靠地处理上述问题，计划进一步开发该系统。还将开发分析模型。此外，首席研究人员与上述研究方向中的一些实验诊断领域的世界领先者建立了密切的合作关系，他们将提供他们的实验数据，并另外执行首席研究人员建议和设计的实验。因此，科学调查的所有三个节点都将得到充分参与。 预计主要成果将是通过档案期刊上的参考出版物向研究和工程界提供选定研究领域的基础性和实用性的发现；对研究生/本科生进行广泛的培训，以激发和在许多方面建立独特的研究环境，并进一步开发用于激波流动的非定常气体动力学的通用计算机代码，这些代码已被世界各地的许多研究人员使用，无疑将为未来的研究工作及其成果的实际应用奠定坚实的基础。